Crank-shaft polisher



Dec. '15, 1925. 1,565,958

L. RENO CRANK SHAFT POLISHER Filed March a. 1924 IN V EN TOR.

- I Lco Fcno Patented Dec. 15, 1925..

UNITED STATES LEO RENO, OF FLINT, MICHIGAN.

PATENT. OFFICE.

own-snarl: POLISHEB.

Application filed larch a, 1924. Serial in. 897,697.

gan, have invented a new and useful Im-v provement in a Crank-Shaft Polisher, of which the following is a specification.

My invention relates to a new and useful improvement in a crank shaft polisher, and has for its object the provision of a crankshaft polisher adapted for operation mech'anically, thus eliminating the necessity of manual operation during the polishing process.

Another object of the invention is the provision of a crankshaft polisher having a polishing medium carried by an arm adapted for rockin in unison with the crankshaft to be 0 ished.

Another 0 ject. of the invention is the provision of a crankshaft polisher which will be simple in structure, economical of manufacture and highly efiicient in use.

Another object of the invention is the provision in' a crankshaft polisher of a carrying arm havin a swingable polishing memher at one en adapted for attachment to the carrying =.member and provided at its opposite end with a .diViSl 1e swingingly mountable bearin member.

Other objects will appear hereinafter.

The invention consists in. the combination and arrangements of parts hereinafter described and claimed. v a

The invention will be best understood by a reference to the accompanyin drawings which form a part of this specific in which,

Fig. 1 is a side elevational view of the invention,

Fig. 2 is a front elevational view showing the invention mounted in oeprative position F1 3 is a sectional view taken on substantially line 3-3 of Fig. 1,

Fi 4 is a sectional view taken on suh stantially line 4-4 of Fig. 1,

Fig. 5 is a fragmentary side elevational view of a modified form of the invention,

Fi 6 is a sectional view taken on su stantially line 6,-6 of Fig. .5.

With crankshaft polisher as now used, it is customary for the operator to retain a carrying arm in his hands durin the polishing operation. The result is that the operator is compelled todo a very fatiguing ation and piece of work inasmuch as the arm which carries the polishing member is reciprocating relatively to him and at the same time travelling in a circle at one end. To eliminate this trying operation on the operator,

the present invention is designed to operate mechanically in conjunction with the crankshaft operated upon.

The invention, in its preferred form, comprises a carrying arm 7 having a semi-circular portion 8 at one end and a similar portion 9 at the opposite end, these semi-circular portions 8 and 9 being formed preferably integral with the arm 7. Hingedly mounted to the portion v9, at 11, is a semicircular portion 10 having an angularly turned portion 12 through which is projected a set screw 13 threaded into a socket formed in the arm 7. The two members 9 and 10 when assembled in operative position constitute a circular bearmg, the inner surface of which is rovided with .suitable wearing material, suc as, babbitt, or a bearing liner, 25. Hingedly mounted to the portion 8, at 15, is a semi-circular member 14 from the free end of which projects a looking arm 16, havin .the upper end thereof tapered and angu arly turned to form a hook 17 which may be engaged by a forward.

bar 19.0n a keeper 18 positloned on the arm 7. Projected through one wall of the keeper 18 is a set screw adapted to engage the arm 7 and serve to bind the arm 16 in close relation to the arm 7. However, mounted on the arm 7 is a stop member21 made from rubber, or some other suitable yieldable material, against which the arm 16 engages when drawn into close position by means of the set screw 20. Formed in the arm 7, at

the lower end thereof, is a slot 23 in which may be plositioned a strip of emery cloth or other po adapted to extend around the interior 0 the portions 8 and 14, and the opposite end thereof en d in a slot 22 formed in the arm 16. l zsired, suitable set screws may be provided for binding. the ends of the emery cloth in 'the slots, or the same may pressed in the slots for snug engagement.

In operation, a pair of crankshafts 26 and 27 are mbunted upon a suitable lathe, or other machine, adapted for rotating the crankshafts in unison. This machine forms no part of this invention and therefore, is not set out in detail in the specification or drawings. The members 9 and 10 are shing material, the cloth 24 bein 1 i with the crank to be polished and the arm 16 swung into parallel position with the arm 7 and locked in this position by means of the keeper 18 and the set screw 20. The use of the yieldable block 21 permits a certain amount of adjustment of the polishing member on the crank, while, at the same time, affording a rigid and durable assembly of parts. When the parts are mounted on the cranks as set out the shafts 26 and 27 are then set into rotation until the desired amount of polishing on the crank is obtained.

In the modified form shown in Fig. 5, I have projected a bolt 28 through the arm 7 and mounted a wing nut 29 on said bolt. In embracing relation with the bolt 28, between the arm 7 and the win nut 29 is positioned a spiral spring 30. an the opposite end of the bolt 28 are pivotally mounted a pair of links 31 and 31, between which is pivotall mounted a pawl 32 adapted to be swung ownwardly relatively to the arm 16 and for engagement in the recess 33, so that the links 31 and 31' embrace the arm 16.

It is thus seen that with a device of this nature, the polishing of the crank can be more efliciently' accomplished, with less manual labor and a co uent reduction of cost. If desired, the ba bit, or lining, 25 may be dispensed with and a lishing member mounted on this end of t e device so that a pair of cranks may be polished simultaneously.

While I have illustrated and described the preferred form of construction, I do not wish to limit myself to the precise details of structure set forth, butdesire avail myself of such variations and modifications as come within the scope of the appended claims.

Having thus described my invention,

ate

what I claim as new and desire to secure byLetters Patent is 1. A crankshaft polisher comprising a carrying arm; a polishing member'associated with said arm adjacent one end thereof and adapted formounting on a crank to be olished; and a bearing member associwith said arm adjacent the opposite end thereof adapted for mountin on a member movable in harmony with the crankshaft to be olished.

2. A cranksha t polisher comprising an arm; an arcuate portion formed on, said arm at opposite sides thereof; co-operating arcuate parts hingedly connected to and associated with said arcuate parts, one of said cooperatin arcuate parts being provided with a radially outwardl extending locking arm; a means on said rst mentioned arm for engaging said lockin arm.

3. A crankshaft polis er comprising a sectional polishing member adapted for mounting on a crank in an embracing relation; a locking arm associated therewith; and means for engaging said locking arm for locking said parts in embracing relation on said crank; and a bearing connected with said polisher adapted for mounting on a co-ordinately moving crank.

4. A crankshaft polisher comprising a carrying arm; a bearing associated with said arm, adjacent one end thereof, adapted for mountingmon a rotatable member; a polishing mem r associated with said arm at the opposite end thereof adapted for mounting on a crank to be polished; a locking arm projecting .from said polishing member; means on 'said carrying arm for engaging said locking arm for retaining said polishing member in operative relation to said crank; and a yieldable abutment member on said arm for enga ing said locking arm.

In testimony w ereof I have signed the foregoing specification.

LEO RENO. 

